Number of odd permutations p of {1,...,n} such that p(i) is not i or i+1.
A293043
Number of odd permutations p of {1,...,n} such that p(i) is not i or i+1.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =7a(6) =49a(7) =336a(8) =2708a(9) =24398a(10) =244298a(11) =2689664a(12) =32297990a(13) =420096141a(14) =5883813379a(15) =88287031264
External references
- oeis: A293043